For boats that require a registration number to be displayed, the number must be 3 inches high, block style lettering, and one color that contrasts the color of the boat. Details can be found in the Ohio Boat Operators Guide, Chapter 1; Registration and Titling Requirements, under Display of Tags and Numbers. http://watercraft.ohiodnr.gov/laws/ohio-boat-operators-guide/ch-1-registration-titling-requirements#r107
Minimum of 3 inches
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